Rotary impact-tool.



Ni. SMITH.

ROTARY IMPACT TOOL.

APPLICATION msu APR. ls. 191s.

WITNESSES www.

Patented Nov. 12, 1918.

2 SHEETS-SHEET l. .g.

M. SMITH.

ROTARY TMTACT TOOL. APPLlcATloN FILED APR. x6. 191B.

,284,80@ Pateted Nov. 12, 1918.4

2 SHEETS-SHEET 2- MICHAEL si/HTH, or P'RTLAD, ort-neon.

ROTARY IMPACT-Toor..

Specification of Letters Patent.

Patented Nov. 12, 19in.

Application led April l16, 1918. Serial No. 228,883.

To` all whom t may concern.

Be it known that` I, MICHAL SMITH', a citizen of the kUnited States, vanday resident of Portland, in the county of Multnomah andtate of Qregon, have inventedanew andlmproved Rotary Impact-Tool, of which the following is a full, clear, 'and exact `description.

My linventiimrelates to rotaryimpact tools and particularlyyto that class of rock `drills in which the drill vsteel may be given a rotaryas well as an axial movement, and one of the main objects of my invention isto provide means which are at :al-l times under the control of the operator for' accomplishing such rotation, thereby accommodating the drill to the different kinds and characters of rock and enabling him to use just the necessary force at all times.

Another ob ect is to accomplishthis rotation without the useof the spiral 'arrangements now known to be,l these being diiiicult ofl-ubricat-ion and quickly subject to wear.

Another object is toeprovide means wherethe drill steel, as when he is spotting a hole.

`Another object is to? provide 4rne'ansqfo'r preventing the axial actuation of the drill steel while permitting its rotation to meet certa-in rock conditions.

Another object is to provide means yieldin g under resistance, as when the drill steel ysticks for any reason, to prevent injury to the drill.

My invention is fully described in the following specification, of which the accompanying drawings form a part, in which like characters refer `to like parts in each ot the views, and in which;

Figure 1 i`s a vertical vsection taken through a ddrill rconstructed accord'an'cewith my invention, as cn the line 1-1 of Fig. 4C.

Fig. 2is a ira'gmentary section taken on the; use 24a 'ef rig. 1..

Figa 3 is a section taken on the line 3 3 of Fig. 1.

. Fig. t is 'a section 'taken on the line 'fFigl.

Fig. 5 is asection -taken on the line 5-#5 of Figa/1,; and y Fig. Gis 'an elevation, partly in section on the line 6- 6 of Lnon a. reduced scale.

Referring morel particularly to the draw by anoperator may prevent the rotation of.

ings, 7 represents the cylinder of a power impact tool which will be referred to hereinafter as a drill and havin-g a pistonv 8 adapted to reciprocate therein under the force of any suitable power fluid -such asav, steam, or the like receivedl through a pipe 11 from any suitable source of power and 'controlled vthrough a-ny convenient valve mech-a- -nijsm included in tlhe casing 14: so as to be admitted into the cylinder Y on Opposite ends or sides of thepist-onin alternation through ports 9 andlO.

The cylinder is provided with a removable head17 serving as a means to assemble the movable parts and to provide access thereto when necessary.

The cylinder is provided with an exhaust port or ports 2O at about its middle or at a position to exhaust. afterthepiston Shas made its full stroke in either direction. Fig. 1 shows the piston after it has made its'down stroke with a ycorresponding impacty against the arret and the drill s teel 21.l Power fluidb'eing then admitted through the 1 0. will; lift the piston causing to pass upward beyond Iche yexhaust port 20 and position to besilbsequently driven downward through the `combined eii'ect of gravity and the power fluid admitted through the port The drill steel is shown provided with a central port through which water may be passed from any suitable source as fore-iiarnple through a passage 23 in the tappet 22 having constant communication with an annular passage 24' in the housing 24 to which the water may be led lthrough a passage 25 from the upper part of thelcasing'or cylinder structure as indicated in Fig'. 6.

The drill steel ismounted ina bushingQ so as to reciprocate but not rotate therein. The bushingv 26, however, is journaled for 'rotation finj the shell 27 constituting the -lwer end portion of the stationarycasing.

The upper endl of the shell 2,7 ^.providfed with a ratchet 28 adapted to be rotated the action of va pawl 29` carried bya horizontally reciprocatable slide block 3'0. See

Figs. 2 and 3.` This block isflvloiimallynheld in the retracted position of Fig. 2'by virtue of one or more springs 31 while its remote end oredge is beveled as shown at 30f, the

direction of the beveling being rearwfardv 22 interposed betw'eenth'e piston and downward or away from the springs 31. Above the block 30 is located a wedge shaped block 32 having a beveled face 32 adapted to cooperate directly with the face 30 of the other block. Theblock 32 is adapted, to reciprocate in the upper portion of the shell 27 and when forced downward by any suitable means it causes the actuation of the block 30 toward and against the force of the springs 31 carrying with it the pawl '29 and causing thereby the apparent rotation of the ratchet 28 and bushing 26 in a clockwise direction as indicated in Fig. 3. l/Vhen the force acting downward upon the block 32 is relieved, however, the springs 31. act to return the block 30 to its normal position so bringing the pawl back to engage a succeeding tooth of the ratchet.

The block 32 is connected by means of a strong spring 33 to the lower end of a plunger 34`slidable in the wall of the maincasing and normally held upward by a sprlng 35. 'The upper end of the plunger is enlarged to provide a bearing surface for one 'end of a bell crank 36 pivoted at 37, the other end of the bell crank projecting across the path of upward movement of the piston 8 so that when the piston is forced upward the bell crank is so rocked around its own pivot as to force the plunger 34 downward. This force is communicated lto the block 32 throughrtwhe strong spring 33 causing thereby the rotation or partial rotation of the pawl as already described. By the interposition, however, of the spring 33 I insure that no damage to the implement can be occasioned by the obstruction or resistance applied yto the drill steel tending to hold it from rotation temporarily.

When the piston 8 is forced toward the tappet 22 the spring 35 on the plunger again raises the same to carry the bell crank into lthe normal position of Fig. 1 ready for another operation, and the spring 31 returns the block 30 and pawl 29 to normal position, ready for another ratchet actuation, it being noted that no spirally operated elements are employed.

The cylinder 7 is provided with two supplemental exhaust ports 38 and 39 normally closed by manually operated valves 40 and 14:1, respectively, the former being opened when it isA desired to rotate the drill steel to permit the fluid under pressure in the cylinder to exhaust before the piston strikes against the tappet 22 and to thus prevent. axial drill steel actuation, and the latter being opened when it is desired to actuate the drill steel axially and to not rotate the same, as in spotting a hole, the power fluid in the cylinder being permitted to exhaust vbefore the piston strikes against the bell crank 36.

It will thus be seen that I provide a drill operation, is very simple in construction and operation, is composed of few parts not likely to get out of order, is light and compact, is readily assembled and disassembled, and is entirely practical.

While I have shown a preferred embodiment of the several features of the invention, I do not desire to limit myself thereto, as changes may be made thereover and come within the spirit of the invention and within the scope of the appended claims.

I claim:

1. In an impact tool, a casing having a cylindrical bore, a piston therein, said cylinder boreA having end inlet ports and an exhaust port uncovered at each full piston stroke, a power fluid supply pipe connected with said end ports, a tool carrier, a ratchet thereon, a spring resisted plunger, means operable thereby for rotating said carrier and ratchet, a bell crank having one arm bearing on said plunger and the other arm arranged in the path of movement of said piston whereby said piston will rock said bell crank to actuate said plunger in each movement in one direction, and means operable by said piston in the other direction' of movement for actuating the tool axially.

2. In an impact tool, a casing having a cylindrical bore, a piston therein, said bore having end inlet ports and a central exhaust port uncovered at each full piston stroke, a power fluid supply pipe connected with said inlet ports, a tool carrier, a ratchet thereon, a sprmg resisted slide block in said casing, a pawl carried thereby for actuating said ratchet, a supplemental wedge shaped slide block, said slide blocks having opposed beveled surfaces whereby said rst named slide block will be moved by the movement in one direction of said second named slide block, a spring resistedrplunger acting on said second slide block, a bell crank having one arm bearing on said plunger and the other arm arranged in the path of movement of said piston, whereby said plunger will be actuated in each piston movement in one direction to rotate said carrier, and a tappet operable by said piston in the other direction of movement for actuating the tool axially.

3. An impact tool having a cylindrical bore, a piston therein, a power fluid supply pipe, a valve controlling the admission of fluid to opposite ends of said. bore alternately, a tool carrier, means operable by said piston in one direction of movement ior rotating said carrier, means operable by said piston in the other direction of movement for actuating the tool axially, and means for rendering said carrier rotating means inoperative consisting of an exhaust port in said bore uncovered before said piston has' completed a stroke and a manually controlled valve for said exhaust port.

4. In an impact tool having a cylindrical of movement for actuating the tool axially, and means for rendering said last named means inoperative consisting of an exhaust port in said bore uncovered before said plston has completed a stroke and a manually controlled valve for said exhaust port.

MICHAEL SMITH.

bore, a piston therein, a power Huid supply pipe, a valve controlling the admission of Huid to opposite ends of said bore alternately, a tool carrier, a tool therein, means 5 operable by said piston in one direction of movement for rotating said carrier, means operable by said piston in the other direction Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents, Washington, D. C. 

